Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85d8ae7e1ee86c2…

MALICIOUS

PDF

38.4 KB Created: 2020-08-03 20:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b906658714b7c8c9decf249da4da22 SHA-1: 362a2792d2f358053060e01826078c39d0ce12d5 SHA-256: e85d8ae7e1ee86c2ae29350e0e2ccac24851788e06704e2d492d940e6e1b7577
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high density of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for a free PDF book. This indicates a phishing attempt designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=alacran+enamorado+libro+pdf+gratis
    • http://files.wilchesterelem.com/uploads/1/3/2/6/132680890/butosexam-xujotafa-rusotolagibezi.pdf
    • http://files.reneesgourmetpizzeria.com/uploads/1/3/1/3/131380299/9280124.pdf
    • http://files.annethomassen.com/uploads/1/3/0/9/130969735/3c59b4e7b.pdf
    • http://files.cafeyugo.com/uploads/1/3/2/3/132302940/e03f937d.pdf
    • https://cdn.shopify.com/s/files/1/0428/8253/1481/files/30811499851.pdf
    • https://cdn.shopify.com/s/files/1/0436/5818/2809/files/52836764440.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/fetch_post_form_data.pdf
    • https://cdn.shopify.com/s/files/1/0434/5030/2616/files/35164614212.pdf
    • https://cdn.shopify.com/s/files/1/0429/0723/8567/files/kaxaka.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/basic_flex_spending.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/snopes_andrea_wilson.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/60036840525.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/20159721264.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/32153709083.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/kepivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2581582401.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005523.bin
f6ab3cf2e297bbcb9d39c11bd862028e20ac0599524e6a3f117d63c8c64e8853
pdf-font-stream PDF embedded font (sfnt) at offset 0x5523 5604 bytes
font_01_sfnt_off00006817.bin
0c05106cfc791bf9e46d37f5882a5db83cdb8815f7d2ad05112a10e47df2fa61
pdf-font-stream PDF embedded font (sfnt) at offset 0x6817 11392 bytes